Absolutely not a great difference whatsoever... The 6200 can possibly be unlocked as well, making it a quite strong performer for its price (if your dad would be a mild gamer)... But for a non-gamer, I'd say the 6200 will even give him a better picture... However, ATI's (apart from Matrox) do have always shown a better image quality in 2D than nVidia cards...